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How can I replace a bad tag value with the previous value of the tag?

Question asked by srburnet on Mar 28, 2018
Latest reply on Mar 28, 2018 by John Messinger

We are getting occasional bad data values, always the same large negative number, from an external system operator. I have no ability to make them resolve the problem that is generating the large negative value, so I have been manually dropping the bad value and recalculating all the derived values. Is it possible to create a calculation that replaces the large negative value with the prior value of the tag before it's passed to the rest of our calculations?